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u in (-oo:+oo)
-5/3 = (2/7)*u-(3/2) // - (2/7)*u-(3/2)
3/2-((2/7)*u)-5/3 = 0
(-2/7)*u-5/3+3/2 = 0
-2/7*u-1/6 = 0 // + 1/6
-2/7*u = 1/6 // : -2/7
u = 1/6/(-2/7)
u = -7/12
u = -7/12
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